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ACI 549.4R 2020

ACI 549.4R 2020

$31.96

ACI 549.4R-20: Guide to Design and Construction of Externally Bonded Fabric-Reinforced and Steel-Reinforced Grout Systems for Repair and Strengthening of Concrete Structures

Published By Publication Date Number of Pages
ACI 2020 40
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Fabric-reinforced cementitious matrix (FRCM) and steel-reinforced grout (SRG) systems for rehabilitation and strengthening concrete structures is an alternative to traditional techniques such as fiber-reinforced polymers (FRPs), steel plate bonding, section enlargement, and external post-tensioning. An FRCM/SRG is a composite material consisting of one or more layers of inorganic matrix reinforced with dry fibers in the form of open mesh or fabric. The inorganic matrixes are typically cement-based, lime-based, or geopolymer. When adhered to concrete structural members, they form an FRCM/SRG system that acts as supplemental, externally bonded reinforcement. This guide addresses the history and use of FRCM and SRG systems rehabilitation and strengthening, their unique material properties, and recommendations on their design, construction, and inspection. Guidelines are based on experimental research, analytical work, and field applications. Keywords: cyclic loading; deflection; earthquake-resistant; fabric-reinforced cementitious matrix fatigue systems; fiber-reinforced polymer systems; lap splices; meshes; substrate repair; rehabilitation; surface preparation.

PDF Catalog

PDF Pages PDF Title
3 TITLE PAGE
4 CHAPTER 1—INTRODUCTION AND SCOPE
1.1—Introduction
1.2—Scope
CHAPTER 2—NOTATION AND DEFINITIONS
2.1—Notation
5 2.2—Definitions
6 CHAPTER 3—BACKGROUND
3.1—FRCM and SRG systems features
3.2—Background
14 3.3—Commercially available FRCM/SRG systems
CHAPTER 4—FIELD APPLICATION EXAMPLES
15 4.1—Concrete repair applications
18 CHAPTER 5—FRCM AND SRG CONSTITUENT MATERIALS AND SYSTEM QUALIFICATIONS
5.1—Constituent materials
19 5.2—FRCM and SRG system qualifications
5.3—Physical and mechanical properties of FRCM/SRG
20 5.4—Durability
CHAPTER 6—SHIPPING, STORAGE, AND HANDLING
6.1—Shipping
6.2—Storage
6.3—Handling
21 CHAPTER 7—INSTALLATION
7.1—Contractor qualifications
7.2—Environmental considerations
7.3—Equipment
7.4—Substrate repair and surface preparation
22 7.5—Mixing of mortar matrix
7.6—Application of FRCM/SRG systems
7.7—Alignment of FRCM/SRG reinforcement
7.8—Multiple fabrics and lap splices
7.9—Curing of mortar matrix
7.10—Temporary protection
CHAPTER 8—INSPECTION, EVALUATION, AND ACCEPTANCE
8.1—Inspection
23 8.2—Evaluation and acceptance
24 CHAPTER 9—MAINTENANCE AND REPAIR
9.1—General
9.2—Inspection and assessment
9.3—Repair of strengthening system
9.4—Repair of surface coating
CHAPTER 10—GENERAL DESIGN CONSIDERATIONS FOR REINFORCED CONCRETE STRENGTHENED WITH FRCM/SRG
10.1—Design philosophy
10.2—Strengthening limits
10.3—Selection of FRCM/SRG system
10.4—Design properties
CHAPTER 11—FRCM/SRG REINFORCEMENT DETAILS
25 11.1—Bond and delamination
CHAPTER 12—STRENGTHENING OF REINFORCED CONCRETE MEMBERS WITH FRCM/SRG
12.1—FRCM/SRG flexural strengthening
26 12.2—Shear strengthening
27 12.3—Strengthening for axial force
29 12.4—Design axial strength
12.5—Engineering requirements
12.6—Drawings and specifications
12.7—Submittals
CHAPTER 13—REFERENCES
30 Authored documents
36 APPENDIX A—CONSTITUENT MATERIALS PROPERTIES OF COMMERCIALLY AVAILABLE FRCM SYSTEMS
38 APPENDIX B—DESIGN LIMITATIONS

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